double negation


noun

logic the principle that a statement is equivalent to the denial of its negation, as it is not the case that John is not here meaning John is here

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What does “blatherskite” mean?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012